Interpopulation resource partitioning of Lesser Frigatebirds and the influence of environmental context

Mott, Rowan; Herrod, Ashley; Clarke, Rohan H.

doi:10.1002/ece3.2565

Cited by 7 publications

(5 citation statements)

References 82 publications

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“…Tropicbird Phaethon and frigatebirdFregata species were grouped respectively (Table 1) to boost sample size and make family level models, acknowledging that foraging differences between species within these families have been observed (e.g. Mott et al 2016). Noddy Anous species were modelled as a family group (following evidence of foraging niche overlap; Surman & Wooller 2003, Shephard et al 2018, and large tern Thalasseusand Hydroprogne species were aggregated into a meta-family group for modelling.…”

Section: Tracking Datamentioning

confidence: 99%

“…We also manually removed trips that spent too much time away from the colony, indicating breeding failure. Upper trip duration limits were set at five days for boobies (Mendez et al 2017), 12 days for frigatebirds (Mott et al 2016) and tropicbirds, 14 days for wedge-tailed shearwater long trips (McDuie et al 2015) and sooty terns (Neumann et al 2018), three days for wedge-tailed shearwater short trips (Weimerskirch et al 2020) and two days for noddies and terns (from inspection of data).…”

Section: Tracking Data Processingmentioning

confidence: 99%

“…This could be explained by local adaptation causing homogenisation: when models fitted at large spatial scales average the responses of populations from contrasting habitats, and fail to capture and predict local extremes (hotspots and coldspots) (Paton & Matthiopoulos 2016). Model homogenisation likely affected all species known for local adaptation: frigatebirds (Mott et al 2016); tropicbirds (Diop et al 2018); wedgetailed shearwater (Weimerskirch et al 2020); and in particular boobies, known for their extreme foraging plasticity (Mendez et al 2017, Gilmour et al 2018.…”

Section: Enm Transferabilitymentioning

confidence: 99%

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Refining seabird marine protected areas by predicting habitat inside foraging range - a case study from the global tropics

Miller,

Hemson,

Toit

et al. 2023

Preprint

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Conservation of breeding seabirds typically requires detailed data on where they feed at sea. Ecological niche models (ENMs) can fill data gaps, but rarely perform well when transferred to new regions. Alternatively, the foraging radius approach simply encircles the sea surrounding a breeding seabird colony (a foraging circle), but overestimates foraging habitat. Here, we investigate whether ENMs can transfer (predict) foraging niches of breeding tropical seabirds between global colonies, and whether ENMs can refine foraging circles. We collate a large global dataset of tropical seabird tracks (12000 trips, 16 species, 60 colonies) to build a comprehensive summary of tropical seabird foraging ranges and to train ENMs. We interrogate ENM transferability and assess the confidence with which unsuitable habitat predicted by ENMs can be excluded from within foraging circles. We apply this refinement framework to the Great Barrier Reef (GBR), Australia to identify a network of candidate marine protected areas (MPAs) for seabirds. We found little ability to generalise and transfer breeding tropical seabird foraging niches across all colonies for any species (mean AUC: 0.56, range 0.4-0.82). Low global transferability was partially explained by colony clusters that predicted well internally but other colony clusters poorly. After refinement with ENMs, foraging circles still contained 89% of known foraging areas from tracking data, providing confidence that important foraging habitat was not erroneously excluded by greater refinement from high transferability ENMs nor minor refinement from low transferability ENMs. Foraging radii estimated the total foraging area of the GBR breeding seabird community as 2,941,000 km2, which was refined by excluding between 197,000 km2 and 1,826,000 km2 of unsuitable foraging habitat. ENMs trained on local GBR tracking achieved superior refinement over globally trained models, demonstrating the value of local tracking. Our framework demonstrates an effective method to delineate candidate MPAs for breeding seabirds in data-poor regions.

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Section: Tracking Datamentioning

confidence: 99%

Section: Tracking Data Processingmentioning

confidence: 99%

Section: Enm Transferabilitymentioning

confidence: 99%

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Refining seabird marine protected areas by predicting habitat inside foraging range - a case study from the global tropics

Miller,

Hemson,

Toit

et al. 2023

Preprint

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show abstract

“…Stable isotopes allow tracking of diet over long time scales due to archived specimens and may provide insights on important trophic changes 52 . These changes may occur over very long periods, hundreds of years or decades 49 , 53 , or shorter periods, such as seasons or consecutive years 30 , 54 , 55 . Thus, isotope measurements in historical samples link population trends with diet shifts across time.…”

Section: Introductionmentioning

confidence: 99%

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

van Oordt,

Cuba,

Choy

et al. 2024

Sci Rep

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Hutchison’s niche theory suggests that coexisting competing species occupy non-overlapping hypervolumes, which are theoretical spaces encompassing more than three dimensions, within an n-dimensional space. The analysis of multiple stable isotopes can be used to test these ideas where each isotope can be considered a dimension of niche space. These hypervolumes may change over time in response to variation in behaviour or habitat, within or among species, consequently changing the niche space itself. Here, we use isotopic values of carbon and nitrogen of ten amino acids, as well as sulphur isotopic values, to produce multi-isotope models to examine niche segregation among an assemblage of five coexisting seabird species (ancient murrelet Synthliboramphus antiquus, double-crested cormorant Phalacrocorax auritus, Leach’s storm-petrel Oceanodrama leucorhoa, rhinoceros auklet Cerorhinca monocerata, pelagic cormorant Phalacrocorax pelagicus) that inhabit coastal British Columbia. When only one or two isotope dimensions were considered, the five species overlapped considerably, but segregation increased in more dimensions, but often in complex ways. Thus, each of the five species occupied their own isotopic hypervolume (niche), but that became apparent only when factoring the increased information from sulphur and amino acid specific isotope values, rather than just relying on proxies of δ15N and δ13C alone. For cormorants, there was reduction of niche size for both species consistent with a decline in their dominant prey, Pacific herring Clupea pallasii, from 1970 to 2006. Consistent with niche theory, cormorant species showed segregation across time, with the double-crested demonstrating a marked change in diet in response to prey shifts in a higher dimensional space. In brief, incorporating multiple isotopes (sulfur, PC1 of δ15N [baselines], PC2 of δ15N [trophic position], PC1 and PC2 of δ13C) metrics allowed us to infer changes and differences in food web topology that were not apparent from classic carbon–nitrogen biplots.

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“…For example, Wakefield et al (2013) showed that 12 colonies of northern gannets (Morus bassanus), distributed around the British shoreline, forage in mutually exclusive areas, including six colonies located very close to each other. Other studies reported spatial partitioning between neighboring colonies in a wide range of systems, most commonly in breeding colonies of marine birds (Ainley et al, 2004;Ceia et al, 2015;Corman et al, 2016;Mott et al, 2016;Sánchez et al, 2018;Bolton et al, 2019;Ito et al, 2020;Jessopp et al, 2020), but also in other birds (Cecere et al, 2018), ants (Gordon and Kulig, 1996;Adler and Gordon, 2003;Richardson et al, 2017) and a few other taxa (Ellis et al, 2009;Papastamatiou et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Memory and Conformity, but Not Competition, Explain Spatial Partitioning Between Two Neighboring Fruit Bat Colonies

et al. 2021

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Spatial partitioning between neighboring colonies is considered a widespread phenomenon in colonial species, reported mainly in marine birds. Partitioning is suspected to emerge due to various processes, such as competition, diet specialization, memory, information transfer, or even “foraging cultures.” Yet, empirical evidence from other taxa, and studies that tease apart the relative contribution of the processes underlying partitioning, remain scarce, mostly due to insufficiently detailed movement data. Here, we used high-resolution movement tracks (at 0.125 Hz) of 107 individuals belonging to two neighboring colonies of the Egyptian fruit bat (Rousettus aegyptiacus), a highly gregarious central-place forager, using the ATLAS reverse-GPS system in the Hula Valley, Israel. Based on comparisons between agent-based mechanistic models and observed spatial partitioning patterns, we found high levels of partitioning of both area and tree resources (<11% overlap) that were stable across different fruiting seasons. Importantly, partitioning could not have emerged if the bats’ movement was only limited by food availability and travel distances, as most commonly hypothesized. Rather than density-dependent or between-colony competition, memory, and, to a lesser extent, conformity in tree-use explain how partitioning develops. Elucidating the mechanisms that shape spatial partitioning among neighboring colonies in the wild under variable resource conditions is important for understanding the ecology and evolution of inter-group coexistence, space use patterns and sociality.

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Interpopulation resource partitioning of Lesser Frigatebirds and the influence of environmental context

Cited by 7 publications

References 82 publications

Refining seabird marine protected areas by predicting habitat inside foraging range - a case study from the global tropics

Refining seabird marine protected areas by predicting habitat inside foraging range - a case study from the global tropics

Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years

Memory and Conformity, but Not Competition, Explain Spatial Partitioning Between Two Neighboring Fruit Bat Colonies

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